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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949ebd40166fbc87b8128a045d2e141589c351ada008cfdb3342360d80529910' 
  AND token = 'C3xSkDvhSjy4frUVTms3Nus+Y/71gptq0rVAu45Gmcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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