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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7b7444660f6fb73f5c3009f703e74ae4f209ac2f78c25963702f5c641ec40e' 
  AND token = 'Y357NMl4P308BI5tjjh6jslsMxP0nRPnU0+8XRElMb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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