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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737496bca7feb60870f0627c9c008aef90818c7a2275326fa140f317cd417e1a' 
  AND token = '2oxWSO3tMczLjpKA5B/n5SLdo5zrkie8LOg7U4rYE7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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