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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989f7711480d91bb29fe59eb197e463a6f8ece134e7cf6137b629f1ac3d28809' 
  AND token = 'dNt8hbPEctzNQq6wjrIsgB93Q32RVG+T+WIwEIyhCM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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