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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29adb1768a9a8cc3e3c57caaa10d9b61b1d3b72b3aa82ae92dc48e1d96412e61' 
  AND token = '6Db+OgG5p9EMdBUjNnz16Dz7YA2jxGHUwF/HapxpW9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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