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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041e5b3caa5408e71af9a631800307b63ad2b336ef0c6d53c1db740250e33bb8' 
  AND token = 'hklIaXsZVPXFMc4ZLlXASGTzlGdZlTOFF/uoKQRemOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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