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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e71e6191f88e4be48a6296eaa906908e6273cab5e2b1592592a2b4a4b671725' 
  AND token = 'lMFHE2g/cObb/yA0T7LeC3qhYjo74hFMT/fj8Umhu0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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