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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f738b0c4d8ca6a03d394ee471150ea4ccf5d95cc371e967e69387f7b800394' 
  AND token = '2lryXAs7YhZ7OLCUqhwLl19eJgHnTlx0LROHN3tUXmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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