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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fceb45c7870b51e427bac137e8d62a5f352335be340c471b4334fc7f44c95fb' 
  AND token = 'KBSc1sKIlTg8myFat2EIkWDkDTePsHVzD0eCa+zqHoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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