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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49531a7e689125f92a4ef9eab7a80b350f8c7aa42ac6d0a6aa15cad5db347fb5' 
  AND token = '9eUhEtUqI57ePULCky1LSzWRpTVGRezGpYt0UuI64w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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