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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df34c19c1e07e0cfe6228c123ed8884654e703cdc9d8e9d717eb4464d580d4d' 
  AND token = '/07Bloa+dsh7JRYdnEd1W4FiQZQ0q8BX8puFUTIVHwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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