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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0d343ba6445a4d31cfbe80860228e3c81e88a1428faa66589bf9dce810e8eb' 
  AND token = '4n7BMgARW4ObBYSZzoue6BdHL6uxq/y03jlBAnmwMJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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