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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdf4575168bf4e17c209b5a37cb1b0847693250d51f4997487b68654f629b97' 
  AND token = 'YJkrHLmXeM9ul1E5g2ZTcyOx52xDXl4+vCb5OBV3aBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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