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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ada6c908dbe1d3e90e93766aaf80e4422a3614a6467d46f793db834bb120fb' 
  AND token = 'aIEQusBZSfneCQ6Kp4arklsovpnK4fo1Kg0GElze5FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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