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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8210e766b70950e0edb5a2e57d255d2af8c15fe8656b665094c1617d358088a5' 
  AND token = 'kyxu639fEf4A13z20HPX0Vi8ZFT0fCbD+UNEyE5dZnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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