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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cf2b164688e196ed87355d72d128b63bf80283f69a8915de830427ccf0d61c' 
  AND token = 'cupw8jlDKv2cUQWUZoGxNb4Hwa8FWphvzrK3GIrEvNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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