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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38af90866fddc17b2ba02df9cb85185fae57d58498e9cd13cd8fd1bb60364289' 
  AND token = 'e3q4MytwJp0o805et6os/z9m3IK5NqjEz5SATH9LGlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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