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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cab9a7f170de7b7f7b51c49496f10c4da9cee0e434758a26928746dc065e3b' 
  AND token = 'AR8BJ0RjfFeUdvWDnrkT8o1uz3vCmkyjzhSOMpAGrQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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