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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebf7494632f479d4319f6e4bb4fbf2963e197513f1d850351f544db8f4f99c8' 
  AND token = '0yZCBxKJILfAZkDjTEnjUUWWdbpO14fpw9usLlCr/S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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