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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ebf0ede7f8dcf48e40a2e0b4e98ba7777bcfa41f9061374adca6ac8432beef' 
  AND token = 'acv/tAV3iX1s8wuMZmEz/POJfB7MUWRH05/bcP5Ha8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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