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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a137c48762bcacd9a01d44a3933a01ccabaf8493b39c1e8c5ccf4aeb009b4557' 
  AND token = 'wjplmPVCyNomZuiBiZjnSS/q14HYt5c9iVYOeK8M4X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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