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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ce3957c97af63feb9c8b60433fb207447f5a251608711902828dab00a14e83' 
  AND token = 'gZE19jgA5qYwGdQiG0oC0LWbAFuX7LvtUYEtUjji2h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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