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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc2556a09e344a4cde6e10ba49398e506669427ca8af0190e7f5ff64e52e761' 
  AND token = 'fouWgaKZij5yqwqTqT/f9qUsoKx740k8VXudg+n5dcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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