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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c818be09927d85101d99c8b257c51d30fcbe1cd65a7f1f9f5317c3b1a60fa0' 
  AND token = 'inD5YcfxOP1Nm36Iv+EF2RIsdFihi+jgGeddYbkZZN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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