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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4cfdd751a043bfadc1d43e551cfb8b935c19e294dcfef8dc3aa4bf536bd668' 
  AND token = '7QZZrDpnsmaRNECfPjdsaesAElNgR56WZk46nOm+hRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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