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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd289b9cced74dd54b66cf546cb866aaf0808b04cc89a16e8d5b55940d6427376' 
  AND token = 'tddeFOgLpGkLqzDRON3l7p0h6Znwrn60EuZCWlw1wSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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