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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a553a3f5c586cf5e6f98a4ae3d6e79939497b76882e1af609ce0f848a05def52' 
  AND token = 'lygGE+euBl9AQ/MR8dAjKZ6asmvjM3SC9dhsId2bJrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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