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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4e53f6cc0c148b654b68994bb4d7ab70043d6d50d0c0fc1a0c8c5e6a50011c' 
  AND token = 'HOw7GwjnI9fq7zfgZ1wq0w6FKWRXxP2cYUqKfn8RO+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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