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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07710952f7c634c9c497db9142819fbcd922de7a8cf0c6c7662876969d88d28' 
  AND token = 'III8C1ZIg9E1pgPK65rNg7SAq7vV8kxm2LbnDnr9wGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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