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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c964b7612a51ddeed51b89b8c0255c92e0268dff77511ce96ff65e085c18cd8' 
  AND token = 'EgJ1g/lCeAzlEO0695IWl2F5ympHi7G8TyUi4A+RvUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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