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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658168e5eac8943196c8d939a1979beeba3195ac0dcc9dcaf5828e050aedb50e' 
  AND token = 'IXxK8hb0E6dh9LbuFU4Jkibihsva1NuaojEDI3kgZOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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