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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59a3d9246e3ad45206676285244673bc13ce24523150139d545049379b82a2e' 
  AND token = 'ZyZhQ0ZnT6iQhAoMaW7mBaiZFXOoTOLYXSR/UIFDgHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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