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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6fca45b47afd87ea46fc7d92230d61fb12e7b3f4617e14ab0758f5fe7b8263' 
  AND token = '2WI9xmE8tijg8eFUpTLIvNuuIrJU/LXltb79QOS7yKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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