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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd811b3d8b0dc3a35acfb54583c82c0bf652a78c7b1de8d647c57df914799fb8a' 
  AND token = 'x9kSHk1tSfZ3S+mEuB88sbs9eaw6LdGbE8IxJsBaNgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}