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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ce41f8b52a8fc6264cfa0828599179e6ce64fe5f6dbe43fcdef30bb19b2a8a' 
  AND token = 'XQkapzXPM9pTyUROsdpOtayL+MMlcCTI3E/oUT9OE2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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