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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e647ae00b92d5afbc74e730476cf3a59ae7caeef91e6d3219269d3399ad8c3' 
  AND token = '8Kfbv5JCJmEwuvh6gUwj0nqIWFLay352bBNejcwZPu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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