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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ad65d44172718824efca97525c4526c89ac15fb5cd60fa69c3fdfea9e23185' 
  AND token = 'nYcO5sVmuo9a1znbHy43nCb48jfy1+Ee0J+/NTHpa2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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