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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e52167caf9619d8547ea2575c8653a3f541bef08e187ffa14853cff1d881f1' 
  AND token = 'eXwBKx5MYfpHf+SsSnRykG+ekmR3cEApC2GdXKROUdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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