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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636143df03b051b41033fc392b20eb11beb381982143fe556ec81482039454a8' 
  AND token = 'YIbiMYiKJXIp9FUo1BtLac+NDNZ+KzIErlVUC8qaGGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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