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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1493e74985eaca812a9900bdb2ef4d9dfd40fdcc42aa0f7c3a07bfdb74c4260d' 
  AND token = '1ruXsnqjjkI0UZQWxn0l8Pwv0qqo6Z4b9cBQqUREKVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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