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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7193c32ff2d9ae06d28bf8f7594e9a8ec34b21f6b83f1cfda36affc1976a13d' 
  AND token = '5gz2jG0HqLJEx+7n3d/zZn4sdMQExTeaW8jEaqrItSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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