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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1933b34b28bcd8e4d6d0e98cb24986f3e2fdfdc3ec97e2d58d43f07a921d182c' 
  AND token = '0c5GwzGmoLq9ikHwebebIGU9gvDhTzWQZOaINpVdOKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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