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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1497f903b4f40be1fa75eda5e261045b5a218256adb831ed6987b9d935663a' 
  AND token = 'KnKTYEqxWgYcxtO8qL8CLo94uPbKjhUd5Uyqp7PR7EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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