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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee50a7bc7980adf4b8beff3ccd4554dec9b21052932aa80e6dd1c22dd7716673' 
  AND token = 'D5hJZUuI12RO4t4I2E/TbEje76DHe4epOHZ75VeZt/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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