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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96c03b2e9c6a13553412b8f9a8bbf1ff7eea23f59fd54a508fa7472595cadfb' 
  AND token = 'UcIm9Wo+izs7GwuoKiLX8ZAwlbffsJqS3oOk4A7/07I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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