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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff56721b284ce286f16b3c9b3b11426c1b2c8844caa03cd93a1b9eca2250175' 
  AND token = '9am5+hKO0XughmhNBZVaboLyTvGDuWoBd8EdCWe+y8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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