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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949020d5c70f5f264dc404d9f381b413599bfc5e4056333241baecc3beef56e8' 
  AND token = '6cVXuvXrtYiu7ai+t6jbfSRvbunHa9p7iz/j9oXok9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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