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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ad9b02a2c3e364bd01f322e7ed839b1a156a49957258b3a0b8e8be703604d4' 
  AND token = 'DofaD9n7vFXCIsharrA4KiaHDKcwcMVuqiKbIdcnspo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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