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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1db87743d75f78df360090f62d67cde3f8d40fcc3584e665ad880db6de8e465' 
  AND token = '9tt0iCJrnZqtXhTyq7T8jHjOzXlQ/ItlamN+tA5XVoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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