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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f83315bbdee428bb80a60ed0ea6acb2716d5344cab45ba474ccc34e1f9284d2' 
  AND token = 'MtkxZlq58GRp4TxzGoIwK5nNIwTr9mVtR1vL2LG4Nps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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