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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91aa7dff52c9efa0bc28d9a475ebfdbcf837ae227b55e58f46d824eaef3f5a8' 
  AND token = 'UImpTkCFjMzt9fyP8Lfc/eaCe4I1X4TfMGgs+k1M5Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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