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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cade39b7470825e61252e7418834896b08215a4e09b7e6efc2da58d0ef7c3ac8' 
  AND token = 'Uc9KBxJ0bglU4Kzph5GVu2Z04omAG03yJsUwYeOCaJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00185

JSON explain

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