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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c066416cd02a23c77a46b4f206c2d17651eebba5381d85f94b1c6f300fc9950b' 
  AND token = 'rwWn7a3EVWK3q8TJ341IHpJhb6bzSz02c06lEY4e5cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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