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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b737d0c91b47db92504a671b502e190ac09ebe0f5fd3029c3ec96198d2a4a4' 
  AND token = 'cZrbJOEtE6bPzmKEPnZE3qfzbc9qaEXvbjcwhXYre+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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