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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b7e3bb48ac89d355392b262653d6fe49f5197ac1e02a86181e5ed8dc22bc9e' 
  AND token = 'qy1PW9DBPMBvRiLjZpjGatOK7ZbRxxqdV37ZrFPxRHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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