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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76aded32a4c0f7813dffb14cf5db76017be662bdb5c5ed68073032ea45ea7bce' 
  AND token = 'Tn/w70SVhaQSGL8Vt+BEYIldWM3M0tZu18APr7CWy+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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