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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc61356f8213779241e81c321fa50a0912451c58fbf3126441fb9e6b4298635' 
  AND token = '+HaMFjId21RYxmqsfMt4feTDB8whl604WDpNUFcpXas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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