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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa569114616817b5f159e6d83aea89b1f232de569b250665e5d53c4b86fbfa3' 
  AND token = 'lOcj+pHJ5C9Fu8BMbw83D6UW99CNUKoIuB3qpy8plEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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