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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426286a532391558c59c0e681ab55a96fff5eb58b714b1259f27900b862d657c' 
  AND token = '3X2tZbEiARGf0Z8DSfea5uVbDhLOm2HR/rHP5LXtZUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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