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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de4b5e0f7591b2333683421dfc8d0536c5a88154a2ac8061187494662dff8c3' 
  AND token = 's5lbh443BpBNgm0Mle5bMKZUXWIy05CQ3KlHWrMvXuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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