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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0700083ab5b5a3d0e5c02d1c51c8db63e8b997741378136e719eecf7d6367f9e' 
  AND token = 'i665W6ed+pHmW+xBFrZeU9oIcJpwWnjDCg2hO82SM5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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