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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809de7232b317f2abefccbca985df668e902d1bb29294ce213c2fdb795201628' 
  AND token = 'GpfWXyO6eY7DgFRiAKv4btmhAPYiU9A9ci0EC41FPB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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