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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27017cc66939066a0dae0290bb53e348b12425dbec1e29002500d4d1270cb472' 
  AND token = 'xnEz8YWaigUuOv/Hf1bFVf5DJDQ1ts4q0quD3q8B894=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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