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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17559bab8be19cbe9baa0097ef6af84c4cbb60afcbd9438d9c23c60dfbf81d61' 
  AND token = 'AwHvbkyz3H9BBeFuHOVVanZ9s6E7h3G2w6X+z8gf7sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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