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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf712b148d54dbff0074ade343269bf867c84c5f955b28b9e169b463af56cee1' 
  AND token = 'Za4EKzEKnano2Uh2pB7U9hbR2hY2ISe6TM26svkPzRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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