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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202fe9d483aa25f7fb40b4df1b9a7f129db2fe34df057bdb325cb76e2d5810c3' 
  AND token = 'RLIvtFnK4qYPm9t3l0beH9kNAsZXXWyxEpASItIF7UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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