SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bfe8ec7b52845e6a757feba09e7f03f9b6c1967a3c0d24f430171246210e83' 
  AND token = 'hqHsE0SQj9pzoRGsXg1OAtuhPlW2jvVLwcNFZOR/rvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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