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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0e6bbb6934145bc9d44c80fd1a4c045d573dc31701b63cd9a35e1f13af3091' 
  AND token = '8BniktVQdV70mJhBkZYaFPVS3M2g0mYYZ3fFM+L9hxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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