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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084d71de42dadf16f42f6463aab690ee5fcc0c0622a526d340c4359474a4979d' 
  AND token = 'apWW+fNnF9D9cgrMUKDhI9BXZPOwhsgW4N/MKhcjVEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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