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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4a380e262d4bb680967ca377a90b3ac5f51caa253810f10170508600258b84' 
  AND token = '8ZnSwh2n6AxlPs8dvQReAx/iHvlI1JocdwK6Uau1At0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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